KR20000067490A - Hydraulic lash adjuster of valve for vehicle - Google Patents

Abstract

PURPOSE: A lifting device is provided to improve operation of suction and exhaust valves and prevent noise by improving a plunger of the lifting device so as to remove an air flowed into a high pressure chamber along with an engine oil. CONSTITUTION: A lifting device(30) comprises a body(37), a plunger body(40) inserted into the body, a plunger(41), an oil passage(45), and an air slot. The body accommodates a valve stem end(33) of suction and exhaust valves(21,22) inserted into a valve guide groove(35) formed at a cylinder header(13) of an engine, and receives an engine oil through an engine oil passage(36) formed at the cylinder header. The plunger is accommodated into the plunger body and forms a low pressure chamber(43) and a high pressure chamber(44) using a diaphragm(42). The high pressure chamber accommodates sequentially a check ball(46), a retainer(47) and a return spring(48). The oil passage is formed at the body contacting an end of the plunger so as to allow an engine oil to flow into the low pressure chamber. The air slot is formed at an outer periphery of the plunger so as to allow an air flowed along an engine oil to be smoothly discharged.

Description

Lifting device for automobile intake and exhaust valves {Hydraulic lash adjuster of valve for vehicle}

The present invention relates to a hydronic lash adjuster for automobile intake / exhaust valves. More specifically, the intake / exhaust valves of the intake / exhaust valves can be directly operated without using a rocker arm. It relates to an improvement in hydronic lash adjust used for lift of valves.

Intake and exhaust valves for automobiles are installed in the engine to supply a mixer into the combustion chamber of the cylinder and to serve to discharge the exploded exhaust gas.

Such an intake / exhaust valve is an operation of opening and closing by a crank pulley fixed to the crankshaft and a camshaft connected to a timing pulley and a timing belt fixed to one end of the camshaft installed on the cylinder header.

Looking at the engine for a vehicle to which the intake, exhaust valve as described above is applied to FIG. 1 as follows.

Automotive engine 10 is;

Largely composed of a cylinder block 12 having a cylinder 11 therein, a cylinder header 13 coupled to an upper side of the cylinder block 12, and an oil pan 14 coupled to a lower side of the cylinder block 12. do.

The cylinder 11 formed inside the cylinder block 12 includes a piston 15 for performing suction, compression, explosion, and exhaust stroke while reciprocating in the up and down direction of the cylinder 11.

The piston 15 is located below the cylinder block 12 and is connected to the connecting rod 17 as a means for converting the reciprocating linear motion of the piston 15 into a rotational motion and transferring it to the crankshaft 16.

The cylinder header 13 coupled to the upper portion of the cylinder block 12 is compressed with an intake valve 21 for inhaling a mixture of air and fuel passed through the air cleaner 19 and the throttle valve 20. The mixer has an ignition plug for exploding, an exhaust valve 22 for discharging the exploded combustion gas, and the like.

As described above, the piston 15 reciprocates in the up and down direction of the cylinder 11 through the suction, compression, explosion, and exhaust stroke of the mixer, and the reciprocating movement is performed through the connecting rod 17. 16, the crankshaft 16 is converted to the rotational movement to be transmitted to the transmission to obtain a driving force to drive the car.

The intake / exhaust valves 21 and 22 of the vehicle engine 10 as described above are moved to the DOHC type while the engine type is changed to the DOHC type, and thus the valve is opened and closed by the push rod and the rocker arm. Direct drive by camshaft is adopted to improve intake and exhaust valve followability.

In the case of the intake and exhaust valves used in the DOHC engine as described above, the valve gap adjustment is a significant problem.

This problem is solved by providing a lifting device (Hydraulic lash adjuster) on the valve stem end of the upper end of the valve stem of the intake and exhaust valves, while eliminating the need for clearance adjustment and improving maintenance and quietness.

Looking at the intake, exhaust valve lifting device 30 as described above in detail with reference to FIG.

The lifting device 30 is a valve spring 33 between the cam shaft 31 is installed in the transverse direction of the cylinder header 13 coupled to the upper side of the cylinder block 12 and the combustion chamber 32 of the cylinder 11. It is installed on the valve stem end 33 of the intake and exhaust valves 21 and 22 provided via the valve.

The lifting device 30 is formed in the cylinder header 13 while receiving the valve stem end 33 of the intake and exhaust valves 21 and 22 inserted into the valve guide groove 35 formed in the cylinder header 13. A body 37 that receives engine oil through the engine oil passage 36 is provided.

Inside the body 37, a plunger body 40 which is airtight with the inside of the body 37 is located by a flange 38 which is connected to the valve stem end 33 and protrudes laterally.

The plunger body 41 is accommodated in the plunger body 40 and the low pressure chamber is formed on the upper part of the partition wall 42 by the partition wall 42 formed with the through hole 42 'in the center of the plunger 41. 43 is formed and a high pressure chamber 44 is formed below the partition 42.

An oil passage 45 is formed in the body 37 which is in contact with the end portion of the plunger 41 to allow the engine oil to flow into the low pressure chamber 43.

The high pressure chamber 44 is a configuration in which the check ball 46, the retainer 47, and the return spring 48 are sequentially interposed.

Conventionally, as shown in FIG. 5, when the air contained in the engine oil is introduced into the high pressure chamber 1, the lifting device 4 is caused by a sponge phenomenon because there is no means or a device for removing the introduced air. There is a problem that causes malfunction or noise.

This is because the inflow air presses the body 5 of the lifting device 4 by the operation of the camshaft 2 and the cam 3 so that the check ball 6 of the high pressure chamber 1 blocks the through hole 6 '. As the pressure of the high pressure chamber 1 rises, the engine oil moved to the low pressure chamber 9 through the leak gap G between the plunger body 7 and the plunger 8 cannot move together with the gap G phase. Because it remains in.

If the air introduced as described above cannot be removed, the normal operation (due to the sponge phenomenon) of the lifting device 5 is impossible, so that the gap between the lifting device and the camshaft phase cannot always be zeroed. Therefore, it has the above-mentioned problem.

Accordingly, the present invention has been made to solve the problems described above to remove the sponge phenomenon by improving the plunger of the lifting device to remove the air introduced into the high pressure chamber of the lifting device through the engine oil (discharge into the low pressure chamber). It aims to improve the operability of intake / exhaust valve and to prevent noise by eliminating gap between camshaft and lifting device.

1 is a schematic cross-sectional configuration of an engine for a vehicle for explaining the present invention.

Figure 2 is a cross-sectional view of the intake, exhaust valve lifting device for explaining the present invention.

Figure 3 is a perspective view taken from the plunger which is the main part of the intake and exhaust valve lifting apparatus to which the technique of the present invention is applied.

Figure 4 is a sectional view of the plunger of the intake and exhaust valve lifting device of Figure 3;

Figure 5 is a cross-sectional view of the plunger portion of the conventional intake, exhaust valve lifting device applied.

* Description of the symbols used in the main parts of the drawings *

30; Lifting device

37; body

40; Plunger Body

41; plunger

50; Air slot

52; Round slot

53,54; Discharge slot

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the preferred embodiment of the present invention for achieving the above object.

1 is a schematic cross-sectional configuration diagram of a vehicle engine for explaining the present invention, Figure 2 is a cross-sectional view of the intake, exhaust valve lifting device for explaining the present invention, Figure 3 is a suction, 4 is a perspective view illustrating the plunger which is a main part of the exhaust valve lifting device, and FIG. 4 will be described together with a plunger cross-sectional view of the intake / exhaust valve lifting device of FIG. 3.

Intake and exhaust valves 21 and 22 installed on the cylinder header 13 of the vehicle engine 10 to supply a mixer to the cylinder 11 and to perform exhaust gas discharged by explosion;

Means for bringing the gap between the cam shafts 31 for operating the intake and exhaust valves 21 and 22 into zero;

Through the engine oil passage 36 formed in the cylinder header 13 while receiving the valve stem end 33 of the intake and exhaust valves 21 and 22 inserted into the valve guide groove 35 of the cylinder header 13. A body 37 that receives the engine oil is provided.

Inside the body 37, a plunger body 40 which is airtight with the inside of the body 37 is located by a flange 38 which is connected to the valve stem end 33 and protrudes laterally.

The plunger body 41 is accommodated in the plunger body 40 and the low pressure chamber is formed on the upper part of the partition wall 42 by the partition wall 42 formed with the through hole 42 'in the center of the plunger 41. 43 is formed and a high pressure chamber 44 is formed below the partition 42.

An oil passage 45 is formed in the body 37 which is in contact with the end portion of the plunger 41 to allow the engine oil to flow into the low pressure chamber 43.

In the high pressure chamber 44, the check ball 46, the retainer 47, and the return spring 48 are sequentially interposed to form an intake and exhaust valve lifting device 30.

In the present invention, by lifting the plunger 41 of the lifting device 30 to be discharged to the low pressure chamber 43 quickly even if the air flows through the engine oil in the high pressure chamber 44 to perform a smooth operation by lifting The device 30 allows the original purpose to be achieved.

To this end, in the present invention;

An air slot 50 for smoothly discharging air introduced into the outer diameter portion of the plunger 41 accommodated in the plunger body 40 of the lifting device 30 is formed.

The air slot 50 is formed in a circular shape in the middle of the plunger 41 and the circular slot 52 for collecting air on the leak gap 51 between the plunger 41 and the plunger body 40 and the It is composed of a plurality of discharge slots (53, 54) formed in a straight line from the circular slot 52 to the upper end of the plunger (41) so that the collected air can be introduced into the low pressure chamber (43).

Looking at the action of the lifting device 30 configured as described above in detail as follows.

When the body 37 connected to the camshaft 31 is loaded by the camshaft 31, the check ball 46 of the high pressure chamber 44 intercepts the through hole 42 'and there is no flow of engine oil. Therefore, the pressure in the high pressure chamber 44 is increased.

At this time, the engine oil in the high pressure chamber 44 is stored in the low pressure chamber 43 through the leak gap 51 between the plunger 41 and the plunger body 40 partitioning the high pressure chamber 44 and the low pressure chamber 43. By moving to the pressure gap between the high pressure chamber 44 and the low pressure chamber 43, the gap of the valve is automatically compensated.

In the above state, when the load applied to the body 37 is removed, the check ball 46 that controls the through hole 42 'is opened, and the engine oil of the low pressure chamber 43 is filled into the high pressure chamber 44. It will be switched to state.

By operating in a continuous repetition of the above operation to adjust the gap of the valve in this process the air introduced through the engine oil is located in the high pressure chamber 44, the engine oil is moved to the low pressure chamber through the leak gap 51 When the air moves together.

In the present invention, the air slot 50 is formed on the plunger 41 constituting the leak gap 51 so that the air can be collected and quickly discharged.

That is, the air moving from the high pressure chamber 44 to the low pressure chamber is firstly assembled in the circular slot 52 formed at the center of the plunger 41, and the collected air is based on the circular slot 52. The discharge slots 53 and 54 extending to the upper end of the plunger 41 are quickly moved to the low pressure chamber.

Therefore, it is possible to expect smooth operability by preventing a sponge phenomenon caused by air in the process of the lifting device 30 is operated, it is possible to prevent the noise caused by the sponge phenomenon.

The present invention as described above improves the plunger of the lifting device to remove the air introduced into the high pressure chamber of the lifting device through the engine oil (discharge into the low pressure chamber) to eliminate the phenomenon of the sponge so that there is no gap between the camshaft and the lifting device This improves the operability of the intake and exhaust valves and has the effect of preventing noise.

Claims (3)

An engine formed in the cylinder header 13 while accommodating the valve stem end 33 of the intake and exhaust valves 21 and 22 inserted into the valve guide groove 35 formed in the cylinder header 13 of the automotive engine 10. A body 37 receiving engine oil through the oil passage 36; A plunger body (40) inserted into the body (37) and connected to the valve stem end (33) to maintain airtight with the body (37) by a flange (38) projecting laterally; The low pressure chamber 43, the check ball 46, the retainer 47, and the return spring 48 are formed by the partition wall 42 which is accommodated in the plunger body 40 and has a through hole 42 ′ at the center thereof. A plunger 41 which forms the high pressure chamber 44 which is interposed sequentially; The body 37 which is in contact with the end of the plunger 41 includes an oil passage 45 formed to allow the engine oil to flow into the low pressure chamber 43; Intake and exhaust provided as a means for making the gap between the intake and exhaust valves 21 and 22 and the cam shaft 31 for operating the intake and exhaust valves 21 and 22 into a zero state. In the valve lifting device (30); And an air slot 50 for smoothly discharging the air introduced through the engine oil to the outer diameter portion of the plunger 41 accommodated in the plunger body 40 of the lifting device 30. Lifting device for automobile intake and exhaust valves. The method of claim 1; The air slot 50 is; A circular slot 52 formed in the middle of the plunger 41 to collect air on the leak gap 51 between the plunger 41 and the plunger body 40; Automobile suction, characterized in that consisting of discharge slots 53, 54 formed in a straight line from the circular slot 52 to the upper end of the plunger 41 to introduce the collected air into the low pressure chamber 43 , Lifting device for exhaust valve. The method of claim 1; Lifting device for the vehicle intake, exhaust valve, characterized in that the air slot 50, the discharge slots (53, 54) are formed in a number so as to facilitate the discharge of air.